[ModelBinderType(typeof(OrganizationEditorForm))]
public class OrganizationEditorFormModelBinder : DefaultModelBinder
{
    public ILogger Logger { get; set; }

    private readonly ApplicationDbContext dbContext;

    public OrganizationEditorFormModelBinder(ApplicationDbContext dbContext)
    {
        this.dbContext = dbContext;
    }

    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        Logger.Trace("BindModel");

        if(bindingContext.ModelType != typeof(OrganizationEditorForm))
            return base.BindModel(controllerContext, bindingContext);

        var form = base.BindModel(controllerContext, bindingContext)
            .CastOrDefault<OrganizationEditorForm>();

        if (form.ParentOrganizationId.HasValue)
            form.ParentOrganization = dbContext.Organizations
                .FirstOrDefault(o => o.Id == form.ParentOrganizationId);

        return form;
    }
}